Learing to Theme

Ok... I'm trying to learn how to theme myself. I'm loving the new Fission ROM but it has that dang grey/white status bar. I was wanting a black bar with white text and the dark/transparent notifications drop down. I am editing the files I need to edit. But what do I edit to make my text white instead of black in the title bar (status bar). And where do I start trying to edit the notification area at in the files?